<label #labelRef class="ti3-radio" for="{{id}}" [id]="appendId('radio')">
  <!-- span标签不能设置for属性，会报错，因为for不是span标签的原有属性 -->
  <!-- 兼容IE11添加spacebar事件 -->
  <span
    #proxyRef
    class="ti3-radio-skin"
    tiOutline
    (keydown.spacebar)="onSpaceKeydown($event)"
    (keyup.spacebar)="onSpaceKeyup($event)"
    (keydown.space)="onSpaceKeydown($event)"
    (keyup.space)="onSpaceKeyup($event)"
  ></span>
  <span *ngIf="label" class="ti3-radio-label" [id]="appendId('label')">{{label}}</span>
</label>
